Method and apparatus for controlling rotary machine coupled to a turbo engine

(19)

(11)

EP 1 122 879 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	04.06.2003 Bulletin 2003/23

(43)	Date of publication A2:
	08.08.2001 Bulletin 2001/32

(21)	Application number: 01300774.5

(22)	Date of filing: 29.01.2001

(51)	International Patent Classification (IPC)⁷: H02P 9/08, H02P 9/44, F02N 11/08

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

31.01.2000 US 495443

(71)	Applicant: Ecostar Electric Drive Systems L.L.C.
	Dearborn, Michigan 48120 (US)

(72)	Inventor:
	Cheng, Bing West Bloomfield, Michigan 48322 (US)

(74)	Representative: Messulam, Alec Moses et al
	A. Messulam & Co. Ltd., 43-45 High Road Bushey Heath, Herts WD23 1EE Bushey Heath, Herts WD23 1EE (GB)

(54)	Method and apparatus for controlling rotary machine coupled to a turbo engine

(57) A method and apparatus for controlling a permanent magnet synchronous motor (8) coupled to a turbo engine such that transient current and steady state current are minimised. The method comprises the steps of, for a given DC bus voltage, determining an acceleration profile as a function of a voltage-offset value, a low-speed rated speed value, a high-speed rated speed value, a first desired speed for warming up the turbo engine, and a second desired speed where the turbo engine has sufficient torque to accelerate to its rated speed without the aid of the permanent magnet synchronous motor (8).

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